Driving and stopping mechanism.



L. E. TUPHAM.

DRIVING AND STOPPING MECHANISM.

APPHCATION FILED FEB. 18. I915- Patented Jan. 11, 1916.

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L. E. TOPHAM.

DRIVING AND S'TOPPlNG MECHANISM. APPLICATION FILED rzs. 13. m5.

1.167.537. Patented Jan. 11, 1916.

6 SHEETS-SHEET 2.

lflmesses: Jaws-razor.-

L. E. TOPHAM. DRIVING AND STOPF'lNG MECHANISM. APPLICATION FILED FEB. |a, xsys.

1,167,537 Patented Jan. 11, 1916.

5\$HEET5-SHEET 3- L. E. TOPHAM.

DRIVING AND STOPPING MECHANISM.

APPLICATION FILED FEB. as. 1915.

1 167,537. Patented Jan. 11, 1916.

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Witness I new 88 MM L E IOPHAM.

DRIVING AND STOPPING MECHAMSM APPLICAHON FILED FEB\18,1915.

Patented Jan. 11, 1916 6 SHEETSSHEET 5.

L. E.'TOPHAM.

DRIVING AND STOPPING MECHANISM APPLICATION FILED ma. 1B. IEII5 Patented Jan. 11, 1916.

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fnvelgorr UNITED STATES PATENT OFFICE.

LAURENCE E. TOPHAM, 0F SWAMPSCOTT, MASSACHUSETTS, ASSIGNOR TO UNITED SHOE KACHINEBY COIPANY, OF PATERSON, NEW JERSEY, A CORPORATION OF NEWJ'EBSEY.

DRIVING AND STOPPING MECHANISM.

Specification of Letters Patent Patented Jan. 1] 1916.

Original application filed October 25, 1911, Serial No. 656,685. Divided and this application filed February T 0 all whom it may concern:

Be it known that I, Laurence E. Torimn, a citizen of the United States, residing at Swampscott in the county of Essex and State of Massachusetts, have invented certain new and useful Improvements in Driving and Stopping Mechanism; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which itappertains to make and use the same.

The present invention relates to driving and stopping mechanism particularly designed for use in shoe sewing machines, but also applicable to other kinds of machines in which it is desirable to stop the driving or cam shaftat a particular point in the cycle of operations The object of the present invention is to provide an improved mechanism by which the or cam shaft of a machine such, for instance as an outsole shoe sewing machine can be stopped in a certain and reliable manner at a predetermined point in the cycle of operations of the machine without undue shock and wear upon the parts and without reversing the direction of rotation of the shaft.

With the above object in view the present invention consists of the provision in a shoe sewing or other machine of the means hereirmfter described and claimed for slowing down the shaft of the machine and driving the shaft at a lower speed and then stopping the machine while it is being driven at its lower Speed at a certain predetermined point in the cycle of operations without reversing the shaft. Inthe mechanism hereinafter specifically described as embodying the invention, high and low speed driving mechanisms for the driving shaft of the machine are provided, the high speed mechauism being in operation during the sewing of the seam and the slow speed mechanism being thrown into operation just before the machine is to be stopped. The slow speed driving mechanism comprises a friction clutch, one member of which is constantly rotated at a low speed and is loose on the driving shaft, while the other member is mounted to rotate with the driving shaft, but is capable of moving longitudinally thereon so as to clutch the shaft to the rotating Serial 170. 8,01 7.

member of the clutch. The clutch members are provided with friction surfaces, which surfaces first act as a brake to slow down the speed of rotation of the driving shaft and then act to drive the shaft at a predetermined low speed. Means are provided for throwing the slow speed clutch into operation at a predetermined time in the cycle of operations of the machine in order that a suflicient length of time may be provided before the clutch is thrown out and the driving shaft stopped for the driving shaft to be slowed down and be driven at a predetermined low speed by the slow speed clutch. The means for throwing the slow speed clutch into operation is automatic in its action and is under the control of the operator, means under the control of the operator being provided whereby the high speed driving mechanism can be thrown out of'operation and the mechanism for throwing in the low speed clutch rendered active. The means for throwing the high speed driving mechanism out of operation and for throwing the low speed clutch into operation constitutes a means under the control of the operator for shifting from the high to the low speed driving mechanism at the end of the sewing operation when the driving shaft of the machine is to be stopped, The low speed driving mechanism is arranged to rotate the driving shaft in the same direction as the high speed mechanism so that the rotation of the shaft does not have to be reversed and the shaft is slowed down to a given speed and then stopped with very little jar or wear on the parts.

This application is a division of application, Serial No. 656,685, for a sewing machine, filed October 2-5, 1911, and in the acoompanying drawings the invention is illustrated as embodied in the machine forming the subject matter of said application The several features of the pres ntinvention will be clearly understood from an inspection of the accompanying drawings in which,

Figure 1 is a view in side elevation of an outsole shoe sewing machine with the pre ferred form of the prwent invention ap plied thereto; Fig. 2 is a plan view partly in section of a portion of the machine illustrating the low speed driving mechanism, the mechanism for shifting from the high to the low speed driving mechanism, and mechanism for raising the prcsscr foot; Fig. 3 is a sectional view taken on the line 3-3 of Fig. 2 illustrating the mechanism shown in Fig. "2; Fig. 4 is a vertical sectional view taken on a plane passing through "the driving shaft; Fig. 5 is a sectional view taken on the line 5-5 of Fig. '2 illustrating the mechanisms shown in Fig. 2; 6 is a. sectional view taken on the line 6-6 of Fig. :2; Fig. T is a detail view in rear elevation of a portion of the presser foot lifting mechanism.

The outsole shoe sewing machine illustrated in the drawings is the curved hook .Jneedle lock stitch machine fully illustrated and described in British Patent No. 23,478 of 1910, and accordingly so much only of -the machine has been illustrated in the Jfite the connection of the present mven 'The pulley 17 is connected through bevel gears 18 with a sleeve 19 mounted on the counter shaft '20 and carrying one member 21 of the main clutch- The counter shaftcarries t-he other member 22 ofxthe clutch and also carries the driving pulley 23',.through which motion is impartedto the shaft The engagement of themembers of the driving clutch is controlledthrough a treadle '23 connected with the clutch operating wedge" 24.. the treadle is depressed. the members of the driving clutch are-forced into engagement and the machine is driven ata speed depending upon the pressure which the operator applies'to the tre'adle' When the treadle is released, the clutch members are thus dis connecting the driving shaft of the machine from the counter shaft. The upward movementof the treadle when it is released also throws into operation the mechanism by which the driving shaft is driven at a low speed and by which the shaft is stopped at a predetermined point in the cycle of operations The slow speed driving mechanism oomprises a forwardly driven friction clutch consisting of the clutch membersflfv and 26. The clutch member 25 is formed on a spiral gear 27 which is loosely mounted on the driving shaft 28 and is driven during the operation by a spiral pinion 29 secured to a shaft 30. The shaft 30 is continuously driven from the driving pulley 23' through a belt 31 pasing over a pulley formed on the hub of the pulley 23 and over a pulley secured to the shaft 30. The other member 26 of the clutch is formed on a flange projecting from a sleeve 33 which is loosely mounted upon the driving shaft The sleeve 33 is free to slide longitudinally 0n the shaft but is connected to rotate with the shaft by means of a block 3 1 secured to the pulley 15' and arranged between lugs 35 proje2ting radially from the sleeve 33. The sleeve is held normally in position with the clutch members out of engagement by a spring 36 arranged in a recess in the blcck 3& and interposed between the bottom of the recess and the head of a bolt which carries a plate 3? engaging the lug 35. The normal position of the clutch sleeve is determined by an adjustable stop screw 38 which may be adjusted to maintain the clutch sleeve in proper relation to the clutch member.

When the clutch members 25 and 26 are engaged they act as a friction brake to absorb the energy due to the momentum of the driving shaft until the shaft is rotating at the same speed as the clutch member 25, after which the driving shaft is driven forvvard at a predetermined low speed by the clutch until the clutch is disengaged, when the shaft is brought to rest at a predetermined point in the cycle of operations of the machine.

To enable the slow speed clutch to be thrown into operation at a predetermined timeejn the-cycle of operations of the machine so that thedriving shaftmay be surely sloweddown tothe speed of the low speed clutch'before the shaft is stopped, mechanism is provided comprising a cam ofacamgroove39 formed inthe sleeve 33 and engaged bv a roll on one arm of a bell crank lever 40. The other end of the bell erank lever is provided with a hole 42 adapted to receive a locking pin 43 which 15 normally held out of engagement with the lever so that duringthe normal running of the machine the lever is oscillated idly by the can, The locking pin is mounted in the end of a slide"?! which is held in normal position by a spring 45. The spring surrounds a bolt 46 extending from the rear end of the slide and is int between a. shoulderon the slide and the inner end of an adjustable screw threaded sleeve 47. The bolt 46 carries a nut 48 which engages the outer end of the sleeve and holds the spring under compression. By adjusting the not, the ccmpresion of the spring may be varied and by adjusting the sleeve 47 the slide may be adjusted to bring the locking pin into proper register with the hole in the end of me lever 40. The locking pin is forced in a direction to engage it with thebell crank lever by a spring 49 and in order that the mechanism for throwing the slow speed clutch into operation may be under the control of the operator. the lower end of the pin is connected with the treadle 23 so that the pin is held down out of engagement with the bell crank lever so long as the treadle is depresed and the main drivin clutch is acting to drive the machine. T e latch 50 is also connected with the lower end of the l pin andisarrangedtoengagea shoulder 51 on the slide 44 and hold the locking pin in its lower position until the treadle has been raised snfiieiently to allow the 101%;- ing pin to engage the bell crank lever. e latch 50 is pivotally mounted upon a block 52 secured to the lower end of the locking pin and is provided below its pivot with a horizontal portion which is acted upon by a spring 53, the tendency of which is to force the latch into engagementwith the end of the slide 4. While the machine is at rest,

the pin 43 is in its raised position in engagemachine frame and extending underneath the horizontal portion of the latch. The arm54isoonnectedbyalink55toablock56 secured to the rod 57 which connects the locking pin 43 with the treadle '23. The rod 57iseonnectedtothelockingpin43bya pin and slot connection indicated at 58, the slot being formed in the upper end of the rod and the pin being mounted in the block 52 at the lower end of the locking pin. With this 3-5 construction, a certain amount of lost motion is pmvided between-the rod 57 and the locking-pin so that when the treadle is de presed and the rod 57 lowered, the pin at first remains stationary while the armi is 40 depressed so as to permit the latch 50 to spring into engagemmt-with the end of the slide 451. Continued downward movementoftherodii'i v fthe pin43outofen t with the levesdfl, and as the latch 45 is-depressed with pin, thelatch en gages underneath ioulder 51- When the treadle 23 is released the latch 50 preents the upward movement of the looking i pinnntilthearmz'idstrikesthehorizontal 5o portion of the latch and removes the'latch from beneath the shoulder 51. When this takes place, the spring 49 forces the pin upward againsttheundersideofthebellcrank lever 40, and when the hole in the lever reg- 55 the pin, the pin snaps up into the hole, thus connecting the lever with the slide 44-.

Thecam39issotimed thatthehole in the end of the bell crank lever is brought into so position to register with the locking pin at the proper time in the cycle of operations of the forming mechanism when the pm isengaged with the bell crank lever, the lever is held from movement about its pivot and the cam 39 acting on the roll carried by the lever. shifts the clutch sleeve 33 to bring the members of the slow speed clutch into engagement. \Vhen the lever and the slide 44 are locked together by the locking pin, the movement of the lever is resisted by the spring 45 and the force with which the members of the friction clutch are pressed to' gether will depend upon the tension of the spring. This may be adjusted to secure the desired braking effect between the members of the friction clutch so that the speed of rotation of the shaft will be slowed down and the shaft be driven at the same speed as the slow speed clutch before the shaft is disconnected'from the clutch and brought to rest. After-the speed of rotation of the shaft has been slowed down, the continued rotation of the shaft by the slow speed clutch causes the cam 39 to disengage the clutch members so that the shaft is disconnected from all driviug mechanism and is brought to rest.

The machine illustrated in the is provided with mechanism acting automatically to lift the preser foot as the machine is stopped. The presser foot lifting mechanism comprises a lever 59 arranged to be engaged by a cam 60 driven from the driving shaftof the machine. The lever 59 ismolmted upon a sleeve 61 so that when actuated by the cam it moves'in a plane at right angla to the axisofthe cam shaft. The sleeve 61 is provided an upwardly projecting arm .62'vvhi'ch is connected by means of a link 63 to the upper end of the bell crank lever 13. A pin 64 projects from the upper endofthebellcmnk13and isarrangedto engage a stop screw 65 in an arm 66 project ing from the hub of the arm 9 which is connected to the praser foot lifting lever of the machine by the rod 8. During the normal operation of the machine in sewing a. seam thelever 59 is out of operative engage ment with the cam 60 so that the lever re mains idle. Just before the machine is stopped," however, the lever 59 is moved into thepathofthecamGOandasthemachine comes to-rest the lever rides up on the raised portion of the cam and the presser foot is lifted from the work. To enable the lever 59 to be moved into and out of operative relation with the cam 60, the lever is pivotally connected to the sleeve 61 by a pivot 67 arranged at right angles to the axis of the sleeve. At its lower end and at the rear of the sleeve 61 the lever 59 is provided with a horizontally extending portion 68 and the {Tee end of this portion 68 is offset and provided with a stud 69 substantially in alinement with the axis of the sleeve 61. The stud 69 is engaged by the forward end of a lever 70, the rear end of which is oonnected by a link 71 to the locking pin 43. the construction being such that a downward movement of the locking pin moves the lever 59 about its pivot 67 so that its upper end is at one side of the cam 60 and out of opera tive relation thereto. While the machine is running the pin 43 is held depremed and consequently the mechanism for raising the presser foot is inoperative During the op eration of stopping the machine, however, the pin 43 is raised into its highest position and at this time the lever is moved in a direction to allow the lever 59 to be swung about a pivot 67 into the path of the cam 60. This return movement of the lever 59 is produced by means of the spring 72 connected to the horizontal portion 68 of the lever. The operative relation of the lever 59 with 'the arm 62- is maintained and the on the'pivot pin 6? when the lever 59 is actuatedby the cam 60 is relieved by a pro1eclion 73 on the arm 62 arranged to bear against the rear side of the lever 59. The axial arrangement of the stud 69 with rela tion to the sleeve 61 maintains the stud at all times in operative relation with the lever 70 since the stud is not displaced with relation to the lever when the presser foot lifting mechanism is actuated by the cam 60.

It is often desirable for the operator to drop the presser foot upon the work before starting the machine. This result is secured in the wnstruction in thgetdrawby arranging e connections ween tlifi pin fi and the lever 59 so that the first portion'of the downward movement of the pin moves the lever 59 out of operative relation with the cam, this movement of the lever taking place before the locking pin is completely withdrawn from the bell crank 40.

In the coniruction illustrated in the there is a certain amount of lost motion in the connection between the link 71 and the pin -13. -These connections consist of a slot 74 formed in the upper end of the link 71 and a pin 75 projecting from the block 52 at the lower end of the pin through the slot 54. This lost motion between the link 71 and the pin 43 allows the pin to move upwardly into engagement with the bell crank 40 while the lever 59 still remains out of operative relation with the cam 60. To hold the lever 59 out of operative relation with the cam 60 until the pin 43 has securely engaged the bell crank lever 40, a spring latch T6 is provided mounted upon the upper end of the link 71 and arranged to engage beneath the projection 77 secured to the slide 4.4. While the machine is running the pin 43 is in its lowered position and the latch 76 is beneath and in line with the projection 77. When the treadle is releamd to stop the machine, the upward movement of the link 71 is prevented by the engagement of the latch 76 with the under surface of the projection 77. The latch remains in engagement with the projection until the pin 43 snaps into the hole Q in the lever 40. \Vhen this occurs connection with the lever 70 and moves the latch 76 out of engagement with the projection 77, and allows the link 71 to rise and the lever 59 of the presser foot lifting mechanism to be moved into operative relation with its cam 60. The mechanim for lifting the presser foot as the machine is stopped is therefore controlled in its operation by the mechanism which throws in the low speed driving mechanism. In the construction illustrated in the drawings the lever 59 and cam 60 in addition to forming a partof the presser foot raising mechanism also act as a brake and positive stop to insure the stopping of the driv ing shaft at a predetermined point in the cycle of operations of the machine, the lever pressing against the cam acting as a brake and the shoulder on the cam acting as a positive stop. As has already been demribed, the lever 59 is moved out of engagement with the cam 60 before the main driving clutch is thrown into operation so that these parts offer no resistance to the starting of the machine.

The mechanism above described for raising the preser foot at the completion of the sewing operation also oscillates the bell crank 13 and through the connecting cork 12 releases the tension on the thread simultaneously with the raising of the presser foot.

The nature and scope of the several features of the invention having been'indicated and the preferred embodiment of the several features of the invention having been described, what is claimed is:-

1. A dri and stopp' mechanism. having, in com ination, a sha high speed driving mechanism therefor, low speed driving mechanism therefor, arranged the shaft in the same direction as the high speed mechanism, means under the control of the operator for shifting to the low speed driving mechanism at a certain predetermined time in the rotation of the shaft, and means for stopping the shaft while it i is being driven by the low speed mechanisnt 2. A driving and stopping mechanism, having, in combination, a shaft, high speed driving mechanism therefor, low speed driving mechanism therefor, arranged to drive the shaft in the same direction as the high speed mechanism, means under the control of the operator operating automatically to shift to the low speed driving mechanism at a certain predetermined time in the rotation of the shaft, and means for stopping todrive.

low speedmechanism.

3. A driving and stoppin mechanism having, in combination, a she high speed driving mechanism therefor, speed reducin and driving mechanism therefor arrange to drive the shaft in the same direction as the high speed mechanism, and means under the control of the operator for shifting to the speed reducing and driving mechanism at a predetermined time in the rotation of the shaft and for thereafter throwing said speed reducing and driving mechanism out of operation.

4. A drivin and stopping mechanism having, in com ination, a shaft, high speed the shaft while it is being driven by the driving mechanism therefor, speed reducin and driving mechanism therefor arrange to drive the shaft in the same direction as the high speed mechanism, and means under the control of the operator for shifting to the s eed reducing and driving mechanism and or thereafter throwing said speed reducing and driving mechanism out of operation said means consisting solely of a normally inoperative cam driven by the shaft and connections operated by the cam.

LAURENCE E. TOPHAM.

Witnesses:

BURTON WV. CARY, M. A. HURLEY.

copies of thin patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G.

the shaft while it is being driven by the low speed mechanism.

3. A driving and stoppin mechanism having, in combination, a sha t, high speed driving mechanism therefor, speed reducin and driving mechanism therefor, arrange to drive the shaft in the same direction as the high speed mechanism, and means under the control ofthe operator for shifting to the speed reducing and driving mechanism at a predetermined time in the rotation of the shaft and for thereafter throwing said speed reducing and driving mechanismout of operation.

4. A drivin and stopping mechanism, having, in com ination, a shaft, high speed Copies of this patent may be obtained for setts,

the Patent [sun] driving mechanism therefor, speed reducin and driving mechanism therefor arrange to drive the shaft in the same direction as the high speed mechanism, and means under the control of the operator for shifting to the speed reducing and driving mechanism and for thereafter throwing said speed reducing and driving mechanism out of operation said means consisting solely of a normally inoperative cam driven by the shaft and connections operated by the cam.

LAURENCE E. TOPHAM.

Witnesses:

BURTON V. GARY,

M. A. Human.

It is hereby certified that in Letters Patent No. 1,167,537, granted January 11; 1916, upon the application of Laurence E. Topham, of Svvampscott, Massachufor an improvement-in Driving and Stopping Mechanism, an error appears in the printed specification requiring correction as follows: Page 4, line 101, ior the word cork read cord; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in Signed and sealed this 15th day of February, A. D., 1916.

R. F. WHITEHEAD,

Acting Commissioner of Patents.

flve cents each, by addressing the Commissioner of Patents, Washington, D. O.

It is hereby certified that in Letters Patent No. 1,167,537, granted January 11, 1916, upon the application of Laurence E. Topham, of swampseott, Massachusetts, for an irnprovement in Driving and Stopping Mechanism, an error appears in the printed specification requiring correction as follows: Page 4, line 101, for

the word cork read cord; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent 0112300.

Signed and sealed this 15th day of February, A. D., 1916.

am R. F. WHITEHEAD,

Acting Commissioner of Patents. 

